net: hns3: fix data race between ring->next_to_clean

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hns3_clean_tx_ring calls hns3_nic_reclaim_one_desc to clean
buffers and set ring->next_to_clean, then hns3_nic_net_xmit
reuses the cleaned buffers. But there are no memory barriers
when buffers gets recycled, so the recycled buffers can be
corrupted.

This patch uses smp_store_release to update ring->next_to_clean
and smp_load_acquire to read ring->next_to_clean to properly
hand off buffers from hns3_clean_tx_ring to hns3_nic_net_xmit.

Fixes: 76ad4f0ee7 ("net: hns3: Add support of HNS3 Ethernet Driver for hip08 SoC")
Signed-off-by: Yunsheng Lin <linyunsheng@huawei.com>
Signed-off-by: Peng Li <lipeng321@huawei.com>
Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

...

This commit is contained in:

Yunsheng Lin 2019-04-25 20:42:45 +08:00 • committed by David S. Miller

parent 790d23e7c5

commit 26cda2f161

2 changed files with 16 additions and 5 deletions

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14

drivers/net/ethernet/hisilicon/hns3/hns3_enet.c

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7

drivers/net/ethernet/hisilicon/hns3/hns3_enet.h

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